agents: register Codex seat Bradford for the push check row (#1825, mos-1572); doc only

agents/bradford/README.md

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+# Bradford
+
+Builder seat, Codex gpt-6.1-sol, started by Sage under Q246 and mos-1572. Owns the push check row:
+`scripts/push-check.sh`, which passes a binary only when an approved review candidate lists its path and sha256
+(docs/plans/2026-10-24_push-guard-binary-manifest.md, #1825).
+
+No launcher in this directory. The seat runs as a T3 thread and works in its own worktree. It has no credentials of its
+own; it pushes only its own `bradford/*` branches through the repository credential helper (mos-0981), never `refactor`,
+`main` or another seat's branch. Poe gives the first Codex review and Dewey the Opus 5.5 landing review (mos-1542,
+mos-1571). Registered by Sage on 2026-10-24 so the queue can name the seat as row owner (store.mjs isSeatDir).